Removable back for seats.



No. 814,766. PATBNTED MAR. 13, 1906. w. L. c. CHAMBERS.

REMOVABLE BACK FOR SEATS.

APPLICATION FILED NOV. 29, 1904.

24609666569: w t GfiweL/ twv l 24% /M I y UNITE STATES PATENT OFFICE.

- WORTHY L. 0. CHAMBERS, OF CHICAGO, ILLINOIS.

REMOVABLE BACK FOR sens."

Specification of Letters Patent.

Patented March 13, 1906.

To all whom it may concern.-

Be it known that I, WORTHY L. C. CHAM- BERS, a citizen of the United States, residing at Chicago, in the count of Cook and State of Illinois, have invente new and useful Improvements in Removable Backs for Seats, of which the following is a specification.

This invention relates to removable backs for seats thatare otherwise unprovided with a back.

It relates more especially to means for providing a light, strong, and readil -remov'able and portable support for the back of a person sitting upon a window-sill or other ledge. It ma also serve as a safety device to prevent sue a person from falling.

In the accompan 'ng drawings, Figure 1 shows one form of t g e invention applied to a window-sill, the window being openand read to be occu ied by a person aboutto sit on t ewindowedge to wash the window. ,Fig. 2 shows another embodiment of the invention, and Fig. 3 shows a simplified form thereof.

Referring to the drawings, A represents a window-sill having an edge B rojecting into the room, as is customary in ouses and office-buildings.

C is the Window. I

D D are two side pieces, preferably of stiff wire bent at their forward ends into the shape of hooks E E, suitable to catch under the edge of the sill. The tip portions of these hooks may be bent parallel with the sill, as shown at F, to form extensions which bear against the under side of the seat or sill and receive the strain, thus reducing the intensity of pressure-and danger of marrin the sill and at the same time facilitating a justment of .the hook to fit sills of different thickness.

This is accomplished as follows: The hooks E, being readil expansible and contractile and being ma e of ample capacity,to embrace any desired thickness of sill, the rightangle portion F is then grasped with the hand and bent up or down, so as to contract and expand the hooks as much toward or from the sill as is necessary to adjust it to the proper thickness. By reason of the levera c this may be done with the hand, notwit standing that greater force than can be a lied with the hand would be required if tiie ook sto ped at E and the lever projection F were a sent.

The side pieces or limbs D rest upon the window-sill and project across it from the inside as far as is necessary to make the back come at a suitable place for the use of the occupant. Their length being greater than the ordina width of sills, their rear ends project intoini d air unsupported and unfastened save by the supporting-sill which they'lie across and the fastening by hooking under the front edge thereof, already described, and these rear ends are joined by a back rod G, which preserves their distance apart. It will be seen by reference to the drawings that the hooks and side pieces and the back rod constitute all one piece of wire. The back or portion H of the device that is intended to form a support for the users back runs up and is supported from the rear of the side pieces thus described and is preferably made of one piece of stifi spring-wire, the ends of which are coiled around the back rod and project under the respective side pieces adjacent thereto. .The coils fit loosely, so that they serve as hinges and enable the back to be turned down when not in use, and thus con- 'venientlycarried and stored in a small space.

The stu ends I of the hinge-coils are arrangedto project under the side pieces D and to engage the under sides thereof and serve.

as stops to limit the movement of the back about the hinges where the back has been turned up into'the position suitable for use. When the user leans backward, the strain is received by the back and is resisted by the springy character thereof and torsion of the wire coils. I I I A stronger form of the invention, which also ermits the use of lighter wire, is shown in Fig. 2, in which links, chains, or flexible ties J are introduced between the back ll and side pieces I). In this case part of the stress is sustained by the s rings and part is transmitted as a tension irectly to the hooksE.

It will be observed that the user sits directly on the window-sill and that the device as thus described can be used in connection with any sort of a seat having a ledge to which the front hooks can be attached, and that there is no need that the side pieces conform to the seat, as is clearly indicated in Fig. 1, where the wire bears only upon the front portion of the sill, although the user sits upon the back or outer portion as well.

The back rod G might be omitted, if desired, in which case the back itself would maintain the side pieces at a proper distance apart, and the hinges mi ht also be omitted. I show such a construction in Fig. 3,-but I IIO think it preferable to use .a hinge construction because of the additional conveniences it aflords for packing and portability.

Other changes and variations from the specific-forms shown and described might be -made without departing from the scope of the invention.

I clai1n 1. A removable back for seats, comprising 10 aback piece, supporting side pieces there-' for, underturned expansible and contractile hooks at the front ends of said side pieces to take under the edge of a seat, and extensions on saidhooks to bear against the under side of a seat.

2. A removable back for seats, comprising a back piece, supporting side pieces therefor, a hinge connection between said back piece and said side ieces, underturned expansible 3 and contract'i e hooks at thefront ends of said side pieces to'take under the edge of a seat, and extensions on said hooks which bear against the under side of the seat.

3. Aremovable back for seats, comprising a back rod and side pieces formed ofa single iece of wire, underturned hooks at the ont ends of said side pieces, extensions on said hooks at the ends of said side pieces to bear against the under side of a seat, and a 39 back pivoted to the said back rod.

4. A removable back for seats'comprising a back rod and side pieces formed of a single piece of wire, underturned hooks having right-angle extensions to bear against the 1m- 3 5 der side of the seat, a back piece formed of a single piece of wire and having its free ends coiled about said back rod to form a hinge connection, and extended stubs on said hinge coils to en age said side pieces, and serve as stops to hmit the movement-of the back piece. V

5. A removable back for seats, comprisingv a seat portion formed of a single pieceof W'JIG and havinga back rodand side lumbsflunderturned hooks on the side limbs of said seat portion, right-angle extensions on said hooks to bear against the under side of a seat, a back 7 piece formed of a single piece of wire and havlng its ends coiled about the backrod of said seat portion to form a hinge connection therewith, and tie-links connecting said back piece and the side limbs of said seat portion.

6. A removable back for seats, comprising a seat portion having side limbs formed of'.

Wire with ends underturned to form seat-em gaging'hooks, and a back piececformed of wire and having spring-coil connections with said seat portion. v

7. A removablev back for seats comprising a seat'portion, having side limbs formed of wire with ends underturned to form seat-engaging hooks, and a back piece formed of wire, and having a spring-coil-hinge connect1on .W1th sald seat'portions.

In testimony whereof I hereto aflix my sig-' nature in presence of two subscribing Wit-. 

